Metallurgical furnace.



No. 823,057. PATENTED JUNE 12, 1906. B. 0. LAUTH. MBTALLURGIGAL FURNAGE.

APPLICATION FILED JUNE 22. 1905.

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UNITED sTATEs PATENT OFFICE.

NIETALLURGICAL FUFNACE.`

Specification of Letters Patent.

Patented June 12, 1906.

Application led June 22, 1905. Serial No. 266,436.

To @ZZ whom t may concern:

Be it known that I, BERNARD C. LAUTH, a citizen of the United States, residing at-Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Metallurgical Furnaces; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to metallurgical furnaces, and is an improvement on the furnaces invented by me and for which I have obtained Letters Patent of the United States Nos. 594,111 and 594,112, dated November 23, 1897, the objects of my present invention being to provide means to supply air to the furnace above the hearth; to make an induced current of air through an opening in the roof of the furnace; to eifect an economy in the fuel, increase the heat in the furnace, and save considerable waste in the iron heated in the furnace; and it consists in the construction, combination, and arrangement of devices hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a vertical sectional view of a metallurgical furnace embodying my improvements, and Fig. 2 is a detail sectional view thereof on a plane at right angles to that of Fig. 1 and intersecting .the discharge-nozzles which project from the air-pipes.

The furnace shown in the drawings is constructed as described in the Letters Patent hereinbefore referred to, a being the hearth the end wall 5 c, the stack, d, the outlet-Hue g e, the bridge-wall ;f, the workin doors in one of the side walls g, and h being t e roof, oomposed of the straight roof-walls'i 7c, which extend upwardly to the peak l, the said roof forming a high furnace-chamber m.

In the embodiment of my present invention I provide an air-pipe 1, which is supplied with hot or cold air under pressure from a suitable source and which extends above the roof, parallel with and near the eak thereof, and is provided with a suitab e number of discharge pipes or nozzles 2, which are directed downwardly and discharge air into the furnace-chamber m through openings 3 in the roof of the furnace. Said openings 3 establish communication between the exterior air and the interior of the furnace and are of greater diameter than the said air-discharge pipes or nozzles, so as to cause air to be forced into the furnace-chamber not only from the said discharge pipes or nozzles, but also through said openings 3. The pipe 1 is provided with a suitable regulating-valve 4. The openings 3 are near the apex or peak of the roof at the point where the furnacechamber m is highest. The discharge-nozzles 2 of the air-pipe 1 are comparatively small, their bores at their dischar e ends being in practice about one-fourth o an inch in diameter. These contracted nozzles, owing to the pressure in the pipe 1, discharge jets of air downwardly from the pipe 1 into the f urnace through the openings in its roof a considerable distance below the roof and cause such jets to also force atmospheric air from the exterior of the furnace downwardly into the furnace through the opening in its roof to a considerable distance below the roof and to' set up such motion in the air and supply the same to the furnace-chamber in such quantity as to greatly promote combustion of the fuel in the furnace. The openings through which the nozzles 2 discharge into the furnace-chamber are near the apex of the roof, where the height is greatest from the bottom of the furnace, to create an intense heat by promotinfr combustion at that point. By thus supplying the furnace-chamber with air I am enabled to effect an economy of about twenty per centum in fuel, obtain much better heat, and also save a considerable waste in the iron heated in the furnace.

From the foregoing description, taken in connection with the accompanying drawings, the construction and operation of the invention Will be readily understood without requiring a more extended explanation.

Various changes in the form, proportion, and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

A metallurgical furnace of the class described having a roof provided with an apex and openings near the apex thereof, establishing commimication between the outer air and the interior of the furnace at the point where the height of the furnace above the bottom thereof is greatest, combined with a blast-pipe having contracted nozzles discharging jets of air under pressure through said openings downwardly into the furnace, the diameter IOO IIO

of such openings exceeding that of such noz my hand in presence of two subscribing wit zles so that atmospheric air from the exterior nesses.

of' the furnace is also drawn by sueh jets through said openings downwardly into the BERNARD C LAUTH' 5 furnace to promote combustion therein, sub- Witnesses:

stantially as described. D. P. BERG,

In testimony whereof I have hereunto set JOHN C. STEVENSON. 

